@article{KlieglKemper1999,
  author    = {Kliegl, Reinhold and Kemper, Susan},
  title     = {Concluding observations},
  isbn      = {0-7923-8526-8},
  year      = {1999},
  language  = {en}
}
@book{KemperKliegl1999,
  author    = {Kemper, Susan and Kliegl, Reinhold},
  title     = {Constraints on language : aging, grammar, and memory},
  publisher = {Kluwer},
  address   = {Boston},
  pages     = {324 S.},
  year      = {1999},
  language  = {en}
}